Recognize named Blade slot closing tags

[shuvroroy]

A named Blade slot such as <x-slot:title>Latest update</x-slot:title> was reported as a mismatched component tag. Accept the matching named closer as well as the existing bare </x-slot> spelling, while still reporting unrelated closers.

Regression tests cover tag spans and balance diagnostics for both valid spellings and invalid closers. The existing Laravel demo already exercises the named closer.

Validation: full Cargo tests, library and all-target Clippy with warnings denied, formatting, PHP syntax checks, and both demo assertion suites pass. Laravel analysis reports exactly its three intentional diagnostics. All changed executable Rust lines are covered.

Checklist

If applicable:

• I have updated CHANGELOG.md
• I have updated the documentation (README.md, docs/, examples/)
• I have updated the config schema (config-schema.json)
• I have added/updated tests to cover my changes
• I fully understand the code that I am submitting (what it does,
  how it works, how it's organized), including any code drafted by an LLM.
• For any prose generated by an LLM, I have proof-read and copy-edited with
  an eye towards deleting anything that is irrelevant, clarifying anything
  that is confusing, and adding details that are relevant. This includes,
  for example, commit descriptions, PR descriptions, and code comments.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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